To this yogi, whose mind has become quietened and in whom the rājasa propensities (desires) have attenuated, dawn the comfort and contentment arising from the taintless Brahman.
With the mind trained to become quiet, the yogi does not have to make any special effort to focus it on the Self. The difference between the Self, mind, thought, etc. begins to fade and dissolve.
Krishna says, the yogi begins to experience unlimited bliss emerging from Brahmic expanse. As Brahman is taintless, his experience also is taint-free.
The unique feature is that the yogi does not have to look or strive for anything. Earlier he only had some vague ideas about what he has to achieve. Now it is verily an effortless experience for him, fulfilling in every way. It is like sleep, a conscious-slumber!
Such Self-experience dawns when rajo-guṇa subsides, and sattva increases. This is a culture anyone can take up and pursue. It is wrong to think it is reserved only for a select few. The question is but one of developing and applying true discrimination with sufficient resolve.